I am a technical person, so I can give you only this much:
REGUP- this table contains payment proposal data (transaction F110).
PAYR- The PAYR table only contains items that are paid by the automatic payment program (e.g.F110S). It does not contain for example reversal postings of manual payment postings.
The PAYR table gets updated in program RFFORI01, which is called from the program RFFOUS_C(check prinitng). The field PAYR-EXTRD contains the date on which the Payment Extract was created. The PAYR table serves as a check register and has the details of the checks that were created in each Payment run.
and REGUP is related to payment position
sorry i know only this much
contains the information on the paid items, such as the amount, cash discount and invoice document number. The payment program creates a REGUP record for each paid item in a payment.
contains teh detail of the check, such as check number, amount, receiver. This table is used for reporting on check and bill of exchange forms.
Hope this will help.